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My Ph.D. is in physics. Through my specialization in low-temperature physics, I became involved in a particular application: the development of an extremely sensitive device for recording and precisely localizing human brain activity through measurements of the magnetic fields it generates outside the scalp. Under the supervision of Sam Williamson (a physicist) and Lloyd Kaufman (an experimental psychologist) I used an array of superconductive sensors (SQUID) to study the habituation of human auditory primary and association cortex. I found that the time constant of the psychophysical measured memory for the loudness of a sound correlates exactly with the habituation time constant of the primary auditory cortex. I also studied the human occipital alpha rhythm: We found evidence it arises from a parade of neural excitations at different locations that individually grow and subside in strength in about half a second.